Switch intelligent update edit format from search-replace blocks to unified diff patches

- should use diffs not search/replace as the first try in the intelligent update

└── apps
    └── editor
        └── src
            ├── commands
            │   └── apply-response-command
            │       └── handlers
            │           ├── diff-handler.ts
            │           ├── fast-replace-handler.ts
            │           ├── restore-preview-handler.ts
            │           ├── search-replace-handler.ts
            │           └── truncated-handler.ts
            ├── constants
            │   └── instructions.ts
            └── views
                └── prompt
                    └── backend
                        └── message-handlers
                            ├── handle-fix-all-failed-files.ts
                            ├── handle-intelligent-update-file-in-preview.ts
                            └── utils
                                └── intelligent-update-utils.ts

Author: robertpiosik

apps/editor/src/constants/instructions.ts

@@ -28,21 +28,19 @@ Find correct replacement text for the <missing_text> symbol.`
 export const intelligent_update_task_instructions =
   'Formatting issues in the attached changes prevent us from applying them. Please edit the file correctly without adding explanations or extra text.'
 
-export const intelligent_update_edit_format_instructions = `Respond strictly with a single markdown code block showing the original and updated code snippets with Git-style merge conflict syntax. Example:
-
-\`\`\`python
-<<<<<<< SEARCH
-GREETING = "Welcome everyone!"
-=======
-WISHES = "Have a nice day!"
->>>>>>> REPLACE
-<<<<<<< SEARCH
- def show_greeting():
-   print(GREETING)
-=======
- def show_wishes():
-   print(WISHES)
->>>>>>> REPLACE
+export const intelligent_update_edit_format_instructions = `Respond strictly with a single markdown code block containing a standard unified diff patch. Example:
+
+\`\`\`diff
+--- a/example.py
++++ b/example.py
+@@ -1,5 +1,5 @@
+-GREETING = "Welcome everyone!"
++WISHES = "Have a nice day!"
+
+-def show_greeting():
+-   print(GREETING)
++def show_wishes():
++   print(WISHES)
 \`\`\``
 
 export const intelligent_update_fallback_edit_format_instructions = `Print the updated file in FULL (from cover to cover).`

apps/editor/src/views/prompt/backend/message-handlers/utils/intelligent-update-utils.ts

@@ -20,8 +20,7 @@ import {
   show_configuration_quick_pick,
   map_api_configuration_to_item
 } from '@/utils/show-configuration-quick-pick'
-import { apply_search_replace_to_content } from '@/utils/changes-integration/search-replace-processor/apply-search-replace-to-content'
-import { parse_search_replace_segments } from '@/utils/changes-integration/search-replace-processor/parse-search-replace-segments'
+import { apply_diff } from '@/utils/changes-integration/diff-processor'
 
 export const get_intelligent_update_config = async (
   model_providers_manager: ModelProvidersManager,
@@ -185,15 +184,20 @@ export const process_file = async (params: {
     let final_content = cleaned_content
     if (!params.use_fallback_edit_format) {
       try {
-        final_content = apply_search_replace_to_content({
-          original_content: params.file_content,
-          segments: parse_search_replace_segments(cleaned_content)
+        const ext = params.file_path.split('.').pop()?.toLowerCase()
+        const use_strict_whitespace =
+          ext == 'py' || ext == 'yaml' || ext == 'yml'
+
+        final_content = apply_diff({
+          original_code: params.file_content,
+          diff_patch: cleaned_content,
+          use_strict_whitespace
         })
       } catch (error: any) {
         Logger.warn({
           function_name: 'process_file',
           message:
-            'Failed to apply search-replace blocks, retrying with fallback edit format',
+            'Failed to apply diff patch, retrying with fallback edit format',
           data: { error, file_path: params.file_path }
         })